Slip.



C. S. WI'HGHT.

SUP.

APPLICATION FILED FEB. I4. |918.

1,298,61 9. Patented Miu'. 25, 1919.

s.IIIIHILIIl/IIIIIH mesme,

citizen 'o'f the United States, residing at To in -is a specification.

envian s. WRIGHT,

siriane anni@ or rompo, omo, AssIGNoR 'ro THE NATIONAL sUrrLY COMPANY,

. QF TOLEDO, OHIO, A CORPORATION O F OHIO.

y SLIP.

To alll whom it may concern.'

Beit known that I, CLYDE S. WRIGHT, a

ledo,.'in the county of Lucas and State.of\

0hi o, have invented new and useful Improvements in Slips, of which the follow? y invention relates to slips adapted lfor use Iin rotary well-drilling machines, drivepipe rings, spiders, liners, and like devices for gripping and handling pipes, rods, and

. the like.-

1'5, betweenthe slips,` or`to"v4 prevent their rota- It is one of the objects of this invention to provide ,slips adapted to support pipesrods,

' downwardly.

or` the like against longitudinal movement tion in-the slips," or both. For these 'purposes, I-have provided the slipswith inserts of two kinds, one having longitudinal, and

. kinds may be on the same insert.

the other, transverse teeth, though both"- Other objects are yto reduce thefri'ctional surfaces between the slips andtheir sup port, to reduce the weightof the slips by removing large masses of metal at each side of the reduced frictional bearing surfaces,

' andstill make the slips exceedingly strong,

to enable .comparatively cheap metal tobe used for the body of the slips by providing removable toothed inserts made of highy grade steel for engagement with the -pipe or otherarticle to be handled, to eliminate the i necessity of heat-treating the slips, and to reduce and simplify the lwork of machining the slips. Other objects will"appear hereinafter.

Referring -to the accompanying drawings, Figure 1 is a central vertical section through -the table of a rotary well-drilling machine,

which shows fmy improved slips in central vertical section, the pipe gripped thereby being shown in side elevation andthe section being taken on the 'line'I--L-Fig. 2; Fig. -2 is an enlarged plan view of the central por-l tion of the apparatus shown on Fig. 1; Fig. 3. isai elevation of an' insertwith-longitudin'al teeth; Fig. 4 is an elevation of an'insert with'transverse teeth; Fig. 5.l is ia bottom plan-view of onegof 'the halves of my improved slips; andA Fig. 6 is a transverse section of one of the slips.4

On the drawings, 1 designates a rotary table for a rotary well-drilling machine. It rotates on the rollers v2 supported by t he .base 3, having a large central opening 4 into which an extension 5 of the table extends.

specification of'tetters Patent.

The table has a large vertical opening 6 extending entirely through itand provided y with internal horizontal shoulders-7. Witlrv in this opening is the bushing 8 rotatable with the table and having the external shoulders 9 which rest on the shoulders 7 The table is rotated by the .bevel pinion l,11 which meshes with the teeth -12 on the lower side of the table near its edge.

The apparatus thus far described is well` known.

The bushing number of vertical and preferably radial slotsf13 extending outwardly from the inner. wall of the bushing.

8 is provided with a suitable Within the tapering bushing 10 I place a suitable number, preferablv two, of slips 14, having their exterior surfaces tapered' .to correspond with the ta'per of the wall of the said opening. vIn order to reduce the weight of the slips and reduce the friction and'prevent sticking between the bushing and the slips. I have reduced the taperedk surfaces of the slips which contact with the wall of the. opening 10, tothe ribs or bearingI surfaces` 15, and. except at the top and bottom of the slips, I have these surfaces connected to the bodies of the slips' by the webs 16. The

bottoms of the slips have the horizontal fianges 17 connected to tlie sides pf the ribs 15. la short distance back of the outer faces of the ribs. The lugs 18'extend outwardly Patented Mar.a5,1eia.

Application filed February 14, 1918. Seria1No.217,240. i

. and iix the vertical position of the bushing in the table. The bushing may in the presinto the slots 13 to prevent the'slps from turning in the bushing or .to cause the slips torotate with the bushing.

The inner walls ,of the slips are provided vwith downwardly extending rlovetail slots- 21 open above but terminated below by the shoulders 22.4 Intoy these slots are slid the inserts or gripping bars 24 and 26 projecting inwardly beyond the vertical walls of the slips, thehorizontal sections of the inner Vwalls of the slips preferably coinciding with the arc of a circle slightlv larger than the circumference of thel pipe to be gripped. Some of the inserts. as 24, have longitudinal serrations, or teeth, 25, and others, as 26,

' withinse inserts .m

liavetransverse serrations, or teeth, 27. ln .Tig. 2,-l have shown one slip provided with ;nseirts;hav1 ygfthe .teeth 25 and the other befvariously. arranged, so that both kinds .inaybe in each slip-or in both slips 'acc0rdiiig to theclass oit'v work to he done or to the particular notions 'of thek user. Rivets or screws 28 may be employed to hold the inserts in place.

291represents a pipe in the opening le-` tiifeenfthe slips; The teeth. 27 prevent the the 's1-slips, iii.,k easel pipe are applied tothe same, or to cause the .pipe to rotate lwith the Vtable in case the lat# teris rotatedbythepinion-11.1 rlhe ribs are lccatedat some distance roih the opposing faces of thel slips; that is, when the slips are assembled as shown on Fig. 2, thel ends of the slips adjacenttotheir opposing i'aees .are-.recessed or cutaway so that the, slips -inay not, ati the points opposite thev ends ofthe saidv faces, engage the Wall of the 'tapered opening .1.0 and wedgethen'ein-r4 alli' the slips werenot cut away as just described,

and a pipe smaller thantha't shown; on Fig.

2 were used, the' slips would nievetowaril t each other and lie lower in theopcning lGQf rlhe distance between the-outer edges ofthe slipson the line ll-l would be appreciably `lessened :while'the distance between ltheir outer edges on a line between the sli ps would remain substantially unchanged, the result. .being that'the slips. would.be lightly, if at all ,*gripped bythe wall of the 4opening l() at points between `their."i'zertieal edges, .while great forceat 'theirsends adjacent t0 their 0pposing faces, -withthe result that theyl would become sofwedgedzfnthe opening l() that... they could nojt-begreinoved without exerting. i

. great force `o'r..breaking the slips. rlhe lugs i8 by their 'engagement with the side walls.

of the slots 13. prevent relative rotation-of the slips andthetable or bushing.

aving the teeth 27,lout.- the from slipping, downwardly while the .teet 25 prevent-the pipe roin rotating in.' tonlsf tending to turn the 1 I Il doffnot limit niy invention to thepur- I poses.. described since it is evident' that itA may-,he employed for various functions where pipes,I r0ds,and the like are to be '.suspended, raised, lowered, rotated, or helol from rotation, or where various'conibinations of' these functions are required, as in` drive-pipe rings, spiders', liners,y and othery devices making use of tapered slips.

` The slips herein described are economical in construction since a lower priced material can be used for a greater part of their weight than` isv possible where the` gripping teeth are placed directly; on the'slips; since. a; v

fied; and since heat treatment of theslips which arelarge ybodie's'or1 steel with unequal sectional areas,may'bej' eliininatedor largely so. f lt-is necessary to renew .the inserts only ',whendull, Where theteeth are shar ` n 'the slips-'they can be sharpened,

` if at allf'jjon AIwiththegreatest diliculty, and

when worn; lenti-fthe-v whole s lip must be scrappedf r'llh described slips,by, use of the wehbed hearingfribslyand the elimination milch metal at eachside of, these ribs, are

madecomparativel-y light, and exceedingly strong. for their weight.

claim'- ln a well drillinginachine 'or the like, a

crosssection, and 'a plurality of oircularly greatlyA` reduced weight of material for the slips may. be used;...sii ice the machining of lthe parts is very inueh reduced and smplii holdei` having a tapering opening circular in arranged slipsv having their outer surfaces seated in the said opening and tapered;- to

for-in bearing surfaces to correspond tothe taper of the opening, said slips being cut away at points adjacent'to the ends of their opposed faces to prevent the contact of the Carnia s. wnisiii. 

